Add GOV.UK blue to gov_cols

[nacnudus]

GOV.UK is in the extended palette, and is the only one so far missing from gov_cols(). Unless it was omitted for a reason?

[codecov[bot]]

Codecov Report

Merging #18 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   80.43%   80.43%           
=======================================
  Files           2        2           
  Lines          46       46           
=======================================
  Hits           37       37           
  Misses          9        9

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[ivyleavedtoadflax]

No reason for being excluded, will merge this when the test pass is reported.

[nacnudus]

Thanks!